Not ALL of their music is straight-up psychedelic, but most of it is influenced by that experience. In Through the Out Door is not very trippy except for the intro,
nor are the blues-based tunes. However, many of their songs will bend your mind!
I think the whole Led Zeppelin III is EXTREMELY trippy. Surely inspired by their stay at Bron-Yr-Aur.
Celebration Day, Out On the Tiles, Immigrant Song, and Hats Off to Roy Harper in particular. 'Hats Off' starts out with a backwards looping echo that makes you feel like you're being turned inside out.
And those harmonics on the guitar put you right again!
Other songs that stand out to me as psychedelic are Trampled Underfoot, No Quarter, When The Levee Breaks, The Song Remains The Same, the live version of Dazed and Confused and
Whole Lotta Love, Achilles Last Stand, For Your Life, the Wanton Song, Kashmir, and Going to California. Though I'm sure that trippiness is in the ears of the Beholder.
I'll always be grateful for the mental voyages that Led Zeppelin took us on. However, like any great exploration, the adventure must eventually come to an end.